CN210783675U - Chair seat front and rear adjusting mechanism - Google Patents

Abstract

The utility model discloses a chair seat front and back adjusting mechanism, which comprises a seat frame and a seat board arranged on the seat frame, wherein the seat frame is internally provided with a base fixedly connected with the seat frame, the bottom surface of the seat board is fixedly provided with a sliding seat, and the sliding seat slides back and forth along the base and is relatively fixed through a hand-rotating adjusting screw; the left side and the right side of the sliding seat are respectively provided with a sliding block, the base is provided with a bottom plate, limiting plates are respectively and fixedly arranged above the left side and the right side of the bottom plate, a slideway is formed between each limiting plate and the bottom plate, a notch for the sliding block to enter the slideway is reserved on each limiting plate, and the sliding block can slide back and forth along the slideway after entering the slideway from the notch from top to bottom; a long waist hole is formed in the center of the bottom plate, a threaded connecting hole is formed in the bottom surface of the sliding seat, and a hand-turning adjusting screw penetrates through the long waist hole to be connected with the threaded connecting hole; the length of the long waist hole determines the front-back adjusting range of the chair seat, and after the position of the seat plate is adjusted, the hand-rotating adjusting screw is rotated to tightly support the bottom plate, so that the sliding seat and the base are relatively fixed.

Description

Chair seat front and rear adjusting mechanism

Technical Field

The utility model relates to a thing to sit on field, in particular to seat support front and back adjustment mechanism for seat.

Background

In the growth process of the children, the height of the children can be continuously increased along with the growth of the ages, and due to the change of the height, the children have different requirements on the seating depth of the seat at different ages; therefore, a fixed chair cannot meet the use requirements of children in different age groups.

In the child seat with adjustable sitting depth in the prior art, a plurality of adjusting holes are generally preset on two sides of a seat along the length direction, and when the seat is installed together with chair legs, the corresponding adjusting holes are aligned with the installing holes on the chair legs, and screws are locked in the adjusting holes for fixing; however, this type of adjustment is inconvenient, requiring the chair to be disassembled and then installed after adjustment.

Disclosure of Invention

The utility model overcomes exist not enough among the above-mentioned prior art, provide a convenient seat support front and back adjustment mechanism who adjusts, this mechanism passes through the cooperation of bedplate sliding seat and base, realizes that the bedplate adjusts along the front and back position of base, and it can to adjust the back locking hand-screw adjusting screw.

The technical scheme of the utility model is realized like this:

the seat back and forth adjusting mechanism comprises a seat frame and a seat plate arranged on the seat frame, a base fixedly connected with the seat frame is arranged in the seat frame, a sliding seat is fixedly arranged on the bottom surface of the seat plate, and the sliding seat slides back and forth along the base and is relatively fixed through a hand-rotating adjusting screw; the left side and the right side of the sliding seat are respectively provided with a sliding block, the base is provided with a bottom plate, limiting plates are respectively and fixedly arranged above the left side and the right side of the bottom plate, a slideway is formed between each limiting plate and the bottom plate, a notch for the sliding block to enter the slideway is reserved on each limiting plate, and the sliding block can slide back and forth along the slideway after entering the slideway from the notch from top to bottom; the center of the bottom plate is provided with a long waist hole, the bottom surface of the sliding seat is provided with a threaded connecting hole, and the hand-turning adjusting screw penetrates through the long waist hole to be connected with the threaded connecting hole.

Preferably, the two sides of the bottom plate extend upwards to form side plates, the upper ends of the side plates are bent towards the middle direction of the bottom plate to form transverse plates, the transverse plates are bent downwards to form limiting plates, and the notches are formed in the transverse plates and the limiting plates. Therefore, the sliding seat and the sliding block can be limited in the base area, and meanwhile, the sliding block is limited in the slideway area except the notch when entering the back from the notch and sliding along the front-back direction of the chair seat.

Preferably, the left side and the right side of the sliding seat are respectively provided with two sliding blocks, and the sliding blocks protrude out of the side wall of the sliding seat along the width direction; the two sliding blocks are arranged in tandem at the same side of the sliding seat; correspondingly, two notches are correspondingly arranged on the limiting plates on the left side and the right side of the bottom plate. The bedplate is spacing from top to bottom through two sliders, has guaranteed stability.

Preferably, the seat frame is square, the base is arranged in the middle of the seat frame in the width direction, the front end and the rear end of the base are fixedly connected with the front end and the rear end of the seat frame, and the base is respectively spaced from the two sides of the seat frame. Therefore, after the base is fixedly connected with the seat frame, the connection between the seat frame and the chair legs is not obstructed.

Preferably, the sliding seat is hollow, and is formed by sinking the seat plate from the center, and the upper end of the sliding seat is open.

Preferably, the seat board is provided with a seat cushion, the seat board and the seat cushion are fixedly installed through a rotary buckle, the rotary buckle comprises a cap body, the middle of the cap body is provided with an inserting column, two ends of the diameter of the side wall of the inserting column are respectively provided with a bulge, the seat board and the seat cushion are respectively provided with a slotted hole A and a slotted hole B which correspond to the bulges and the inserting column, the slotted holes A and the slotted holes B are communicated from front to back, the inserting column of the rotary buckle firstly penetrates through the slotted hole A on the seat board and then continuously penetrates through the slotted hole B on the seat cushion, and meanwhile, the rotary buckle enables the bulges to be staggered with the slotted hole B, so that the bulges. The detachable connection of the seat board is realized through the mode, so that the seat cushion can be cleaned, and the seat cushion is very convenient.

Preferably, the seat cushion comprises a seat shell and a soft cushion, and the slotted hole B is formed in the seat shell.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

the adjusting mechanism of the utility model enables the sliding seat to slide back and forth along the seat frame, and the arrangement of the double limiting plates at the two sides of the seat in the seat frame limits the up-and-down movement of the seat board, so that the seat board can not be turned over, and the use safety of the seat board is ensured; the sliding seat is sunk into the base of the seat frame to provide sufficient mechanical support for the seat plate, and the sliding seat is contacted with the bottom plate of the base during sliding, so that certain damping property and friction coefficient are ensured; the length of the long waist hole determines the front-back adjusting range of the chair seat, and after the position of the seat plate is adjusted, the hand-rotating adjusting screw is rotated to tightly support the bottom plate, so that the sliding seat and the base are relatively fixed.

Drawings

Fig. 1 is a schematic perspective view of the seat in the embodiment of the present invention when the seat height is a position a, the seat depth is shallow, and the pedals are in the storage state;

FIG. 2 is a schematic perspective view of a chair leg according to an embodiment of the present invention;

FIG. 3 is a side view of a leg of the present invention in an embodiment;

fig. 4 is an exploded perspective view of the seat and seat plate adjusting mechanism according to the embodiment of the present invention;

fig. 5 is a schematic perspective view of the seat cushion and the seat plate when the seat cushion and the seat plate are not assembled according to the embodiment of the present invention;

fig. 6 is a schematic perspective view of the seat cushion and the seat plate of the present invention after being assembled;

fig. 7 is a front view of the seat cushion and the seat plate of the present invention after being assembled;

fig. 8 is a schematic perspective view illustrating the seat frame and the sliding seat of the embodiment of the present invention when they are not assembled;

fig. 9 is a schematic perspective view of the assembled seat frame and sliding seat according to the embodiment of the present invention;

FIG. 10 is a first perspective view of the seat and seat plate adjustment mechanism of the present invention;

FIG. 11 is a schematic perspective view of the seat and seat plate adjusting mechanism of the present invention after being assembled;

FIG. 12 is a schematic cross-sectional view of the seat and seat plate adjusting mechanism of the present invention;

FIG. 13 is an enlarged view of portion a of FIG. 12;

fig. 14 is a schematic perspective view of the seat in the embodiment of the present invention when the seat height is the B-position, the seat depth is shallow, and the pedals are in use;

fig. 15 is a schematic perspective view of the seat in the embodiment of the present invention, when the sitting height is C-position, the sitting depth is shallow, and the pedals are in the storage state;

fig. 16 is a schematic perspective view of the seat in the embodiment of the present invention when the sitting height is D-position, the sitting depth is shallow, and the pedals are in the retracted state;

FIG. 17 is a side view of the embodiment of the present invention, wherein the sitting height of the chair is B position, the sitting depth is shallow, and the pedals are in use;

FIG. 18 is a side view of the embodiment of the present invention, wherein the seat is in the A position, the sitting depth is shallow, and the pedals are in the storage state;

FIG. 19 is a schematic perspective view of the pedal according to the embodiment of the present invention;

FIG. 20 is a front view of the footrest in the embodiment of the present invention;

FIG. 21 is a schematic perspective view of the pedal connecting member according to the embodiment of the present invention;

FIG. 22 is a schematic perspective view of a chair leg with a caster mounted thereon and another chair leg without a caster mounted thereon according to an embodiment of the present invention;

fig. 23 is a schematic perspective view of the round bar, the flexible carrier cloth and the rear pull rod when they are not combined according to the embodiment of the present invention;

FIG. 24 is a schematic perspective view of the round bar, the flexible carrier cloth and the rear link of the present invention when they are combined with the chair legs;

fig. 25 is a schematic perspective view of the chair with the flexible carrier cloth and the rear pull rod combined with the chair legs and the round bar not inserted therein according to the embodiment of the present invention;

fig. 26 is a side view of the seat in the embodiment of the present invention when the seat is in the B position, the seat is deep, and the pedals are in the storage state;

FIG. 27 is a side view of the embodiment of the present invention, wherein the seat is in the B-position, the sitting depth is shallow, and the pedals are in the storage position;

fig. 28 is a side view of the seat in the embodiment of the present invention when the seat is in the B position, the sitting depth is deep, and the pedals are in the use state;

FIG. 29 is a side view of the embodiment of the present invention, wherein the sitting height of the chair is B position, the sitting depth is shallow, and the pedals are in use;

fig. 30 is a schematic perspective view illustrating a back rest and a backrest of a seat according to an embodiment of the present invention when they are not combined together;

FIG. 31 is an enlarged view of the rotating clasp of FIG. 5;

fig. 32 is an enlarged view of the rotary latch of fig. 4.

The figures are numbered: a chair leg 1; a front leg 11; a rear leg 12; a positioning hole 13;

a seat 2; a seat frame 21; a first regulation hole 211; a second adjustment hole 212; a fastener 213; a seat plate 22; a seat cushion 23;

a chair back 3; a backrest 31;

a seat plate adjusting mechanism 4; a slide base 41; a slider 411; threaded connection holes 412; a base 42; a bottom plate 421; a long waist hole 4211; side plates 422; a transverse plate 423; a limiting plate 424; a chute 425; a notch 426; a hand-screw type adjusting screw 43;

a pedal 5; a pedal mounting hole 51; a folded lug 52; a first ear plate 521; a second ear panel 522; a through hole 5221; a foot-operated knob 53; a screw 531; a convex surface 54; a recessed surface 55;

a caster 6; a wheel 61; caster screws 62; a decorative cover 63; caster mounting holes 64;

a connecting rod 7; a strip-shaped hole 71; a flexible carrier cloth 72; a cloth cover 73; a round bar 74; a rear pull rod 75;

the buckle 8 is rotated; a cap body 81; the insert posts 82; a projection 83; slot a 84; a slot B85.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The specific implementation manner of the utility model is as follows:

example (b): the utility model discloses an important component of seat support front and back adjustment mechanism for this embodiment seat follows the seat and wholly introduces in detail:

as shown in fig. 1 to 32, the present embodiment provides a chair, including left and right symmetric legs 1, a seat 2 sandwiched between the two legs 1, and a chair back 3, where the legs 1 include a front leg 11 and a rear leg 12 that are vertically arranged, and a plurality of positioning holes 13 are formed on the inner side surfaces of the two front legs 11 and the two rear legs 12, which are opposite to each other, and are arranged at intervals along the height direction, in the present embodiment, four positioning holes 13 are formed, and the positioning holes 13 are threaded holes; the seat 2 comprises a square seat frame 21, a seat plate 22 arranged on the seat frame 21 and a seat cushion 23 fixedly arranged on the seat plate 22, wherein the left side and the right side of the seat frame 21 are respectively provided with a first adjusting hole 211 and a second adjusting hole 212 along the length direction of the seat frame 21, the first adjusting hole 211 is a straight long hole, and the second adjusting hole 212 is two independent small holes which are arranged in the front and the back; after the position of the seat 2 is adjusted in the height direction and the front-back direction, the fastening member 213 is inserted into the first and second adjusting holes 211, 212 and screwed into one of the positioning holes 13 of the front and rear legs 11, 12 to fix the position of the seat 2, and the fastening member 213 in this embodiment is a screw.

As shown in fig. 4, 5, 31 and 32, the seat plate 22 and the seat cushion 23 are fixedly mounted by the rotary buckle 8, and the specific mounting manner is as follows: the rotary buckle 8 comprises a cap body 81, wherein the middle part of the cap body 81 is provided with a plug post 82, two ends of the diameter of the plug post 82 are respectively provided with a protrusion 83, four corners of the seat plate 22 and the seat cushion 23 are respectively provided with a slotted hole A84 and a slotted hole B85 corresponding to the protrusion 83 and the plug post 82, wherein the slotted hole A84 and the slotted hole B85 are both penetrated in the front and back direction, the seat cushion 23 comprises a seat shell 231 and a soft cushion 232, and the slotted hole B85 is arranged on the seat shell 231; the installation process is as follows: firstly, after the seat plate 22 and the seat cushion 23 are correspondingly buckled, the inserting column 82 of the rotary buckle 8 firstly passes through the slotted hole A84 on the seat plate 22 and then continuously passes through the slotted hole B85 on the seat cushion 23, the rotary buckle 8 is rotated by 90 degrees, so that the protrusion 83 is staggered with the slotted hole B85, and the cap body 81 is propped against the seat plate 22, thus the seat plate 22 and the seat cushion 23 are clamped together, and the seat plate 22 and the seat cushion 23 can be fixed.

As shown in fig. 1, 14-16, 25 and 30, in this embodiment, the backrest 3 is further provided with a backrest 31, the backrest 31 is connected with the backrest 3 by the rotating buckle 8, and the specific connection process is similar to the connection process of the seat plate 22 and the seat cushion 23, and will not be described herein.

Specifically, when the age of the child is increased, the height and the weight of the child are increased, and when the height of the child is increased to the extent that the current seat does not adapt to the use requirements of the child, the sitting depth and the sitting height of the seat can be adjusted by an adult according to the specific height of the child, so that the seat adapts to the current height of the child; in the chair of the embodiment, the backrest 3 is fixedly arranged between the legs 1, and the seat 2 can be adjusted up and down, i.e. adjusting the sitting height of the seat 2, and back and forth between the two legs 1, i.e. adjusting the sitting depth of the seat 2.

As shown in fig. 3 and 10, the seat of the present embodiment is divided into four gears, specifically, A, B, C, D gears, in the sitting height, and the position of the seat 2 in the gear a is the highest, so that the seat is suitable for a height of about 180 cm; the position of the D-gear seat 2 is the lowest, and the D-gear seat is suitable for about 135cm of height; B. the C gear is a middle gear and is respectively suitable for children with the height of 165cm and the height of 150 cm.

In this embodiment, an example of the adjustment mode when the seat 2 is at the lowest position, i.e. the D-position, is as follows: firstly, the seat 2 is horizontally lifted into the two chair legs 1, a small hole in the second adjusting holes 212 on the two sides of the seat 2 is aligned with a threaded hole indicated by an arrow D in the rear leg 12, at the moment, a screw is inserted into the threaded hole on the inner side surface of the rear leg 12 from the second adjusting hole 212 on the seat frame 21, the screw is tightened to fix the rear end of the seat 2 with the rear leg 12, the first adjusting hole 211 is always aligned with the corresponding threaded hole in the front leg 11 in the length range of the first adjusting hole, the screw is inserted into the corresponding threaded hole of the front leg 11 from the first adjusting hole 211, the screw is tightened to fix the front end of the seat 2 with the front leg 11, and at the moment, the fixation of the seat 2 in the height direction is realized; and the sitting height is at the lowest gear, so that the chair is suitable for children with small age or low height.

When the age of children is increased and the sitting height position needs to be adjusted to other gears, the screws fixed in the first adjusting hole 211 and the second adjusting hole 212 are firstly removed, and then the seat 2 is horizontally lifted to enable the first adjusting hole 211 and the second adjusting hole 212 to be respectively aligned with the threaded holes at the positions of different heights of the front leg 11 and the rear leg 12, so that the adjustment of different gears can be realized.

As shown in fig. 26 to 29, the adjustment of the seat depth of the present embodiment is realized by installing the front small hole or the rear small hole of the second adjusting hole 212 of the seat frame 21 in alignment with the threaded hole of the rear leg 12, respectively, and when the front small hole is installed in alignment with the threaded hole of the rear leg 12, the seat 2 is located at the rear, and the seat depth is deeper; when the rear aperture is aligned with the threaded hole in the rear leg 12, the seat 2 is positioned forward, with a shallower depth.

Above-mentioned adjusting method can adjust the seat when children's height changes and is showing relatively, when children's height changes not very much, only finely tune seat support 2 according to children's user demand can, consequently the utility model discloses set up and finely tune seat board adjustment mechanism 4 of sitting deeply promptly to the front and back position of seat support 2, as shown in fig. 4.

Specifically, the seat plate adjusting mechanism 4 includes a sliding seat 41, a base 42, and a hand-screw adjusting screw 43; the sliding seat 41 is fixedly arranged on the bottom surface of the seat plate 22, two sliding blocks 411 are respectively arranged on the left side and the right side of the sliding seat 41, the sliding blocks 411 protrude out of the side wall of the sliding seat 41 along the width direction, and the two sliding blocks 411 are arranged in tandem on the same side of the sliding seat 41.

As shown in fig. 4-13, the base 42 is disposed at the middle position of the seat frame 21 in the width direction, the front and rear ends of the base 42 are fixedly connected to the front and rear ends of the seat frame 21, and the base 42 is spaced from the two sides of the seat frame 21. The base 42 is provided with a bottom plate 421, the left side and the right side of the bottom plate 421 extend upwards to form side plates 422, the upper ends of the side plates 422 are bent towards the middle direction of the bottom plate 421 to form transverse plates 423, the transverse plates 423 are bent downwards to form limiting plates 424, a slide way 425 is formed between the limiting plates 424 and the bottom plate 421, two notches 426 for the sliding blocks 411 to enter the slide way 425 are reserved on the transverse plates 423 and the limiting plates 424, and the sliding blocks 411 can slide along the slide way 425 after entering the slide way 425 from the notches 426; in addition, a long waist hole 4211 is formed in the center of the bottom plate 421, a threaded connection hole 412 is formed in the bottom surface of the sliding seat 41, and a hand-screw type adjusting screw 43 penetrates through the long waist hole 4211 and is connected with the threaded connection hole 412.

The seat plate adjusting mechanism 4 of the present embodiment specifically adjusts the seat 2 in the following manner: when the chair is installed and an adult wants to finely adjust the chair seat 2 forward and backward according to the use requirement of a child, the hand-rotating adjusting screw 43 is rotated to just enable the sliding block 411 to move forward and backward along the sliding channel 425, at this time, the position of the sliding seat 41 is adjusted, the sliding seat 41 stops moving after the position of the seat plate 22 is adapted to the use requirement of the child, and the hand-rotating adjusting screw 43 is rotated to be abutted against the bottom plate 421, so that the relative fixation between the sliding seat 41 and the base 42 can be realized.

In addition, as shown in fig. 1, 14-18, 19, 20, 25-29, the present invention further provides a foot rest 5 between two front legs 11, wherein a plurality of foot rest mounting holes 51 are provided on the front legs 11 along the height direction, and 2 foot rest mounting holes 51 are provided in the present embodiment, so that the height of the foot rest 5 is adjustable, thereby being capable of adapting to the use requirements of children with different heights; after the pedals 5 are adjusted to a predetermined position in the height direction, both ends of the pedals 5 are fixed in the pedal mounting holes 51.

Specifically, as shown in fig. 1, 14-16, 21, and 25, pedal connectors are fixedly disposed at two ends of the pedal 5, each pedal connector is a folding lug 52, and includes a first ear plate 521 and a second ear plate 522, the first ear plate 521 is fixedly connected to the bottom surface of the pedal 5, a through hole 5221 is disposed on the second ear plate 522, and after the through hole 5221 of the second ear plate 522 is aligned with the pedal mounting hole 51 at the corresponding position of the front leg 11, the pedal knob 53 with a screw 531 is sequentially inserted into the through hole 5221 and the pedal mounting hole 51, so as to connect and fix the pedal 5 and the front leg 11.

More specifically, as shown in fig. 19 and 20, in the front-rear direction of the seat, one surface of the footrest 5 is designed in a convex arc shape, and the other surface of the footrest 5 is designed in a concave arc shape, which are respectively referred to as a convex surface 54 and a concave surface 55; as shown in fig. 14, 17, 25, 28 and 29, when the footrest 5 is needed, i.e., the footrest 5 is in use, the convex surface 54 is arranged at the front end, and the foot can be placed on the footrest 6, so that the comfort of the foot is increased; as shown in fig. 1, 15, 16, 18, 26, and 27, when the footrest 5 is not needed, that is, the footrest 5 is in the storage state, the recessed surface 55 is attached to the front end, and the space of the calf is prevented from being occupied.

Furthermore, as shown in fig. 1, 2, 14-18, 22, and 25-29, the present invention further includes a caster 6 mounted on the side of the lower end of the front leg 11, the caster 6 includes a wheel 61, a caster screw 62 and a decorative cover 63, a caster mounting hole 64 is provided on the side of the lower end of the front leg 11, the caster screw 62 is screwed to the caster mounting hole 64 during the installation, so as to fix the wheel 61 and the front leg 11, and finally the decorative cover 63 is covered.

Furthermore, the utility model discloses a lower extreme face of truckle 6 surpasss terminal surface under front leg 11 downwards. The caster wheels 6 are only added in front of the chair, because the chair has a certain dead weight, children are limited in height and strength, and when the chair without the caster wheels 6 is used, adults need to lift the chair and children need to try out a proper position in front of a desk, which is a troublesome thing for both adults and children; the front legs 11 are additionally provided with the casters 6, so that children with slightly larger feet can freely come in and go out of the learning desk by slightly leaning the chair; for children who are younger in age and cannot land, the adults can easily help the children to come in and go out of the learning desk only by slightly leaning forward the chair; meanwhile, the seat can not move like a pneumatic chair after being laid flat.

Furthermore, as shown in fig. 1-3, 14-18, and 22-29, the present invention further comprises a connecting rod 7 fixedly disposed between the front leg 11 and the rear leg 12, the connecting rod 7 is provided with a bar-shaped hole 71, a flexible carrying cloth 72 is horizontally disposed at the bottom of the seat, and the flexible carrying cloth 72 can be made of any one of non-woven fabric, chemical fiber cloth, or mesh fabric; the left end and the right end of the flexible carrying cloth 72 are both connected with cloth sleeves 73, the flexible carrying cloth 72 is arranged between the two connecting rods 7, and the cloth sleeves 73 penetrate through round bars 74 with the length larger than that of the strip-shaped holes 71 after penetrating through the strip-shaped holes 71, so that the cloth sleeves 73 cannot be separated from the strip-shaped holes 71; the bottom increases the cloth pocket and lets whole seat more flexible pleasing to the eye, has also increased the functionality simultaneously, and the cloth pocket can be put schoolbag, sport equipment, and light containing box class.

Further, as shown in fig. 23, the rear end of the flexible carrier cloth 72 is tied to a rear pull rod 75, the rear pull rod 75 is sandwiched between the two rear legs 12, and both ends of the rear pull rod 75 are connected and fixed to the two rear legs 12. This enhances the load bearing capacity and stability of the flexible carrier cloth 72.

Claims (7)

1. Seat support front and back adjustment mechanism, characterized by: the seat comprises a seat frame and a seat plate arranged on the seat frame, wherein a base fixedly connected with the seat frame is arranged in the seat frame, a sliding seat is fixedly arranged on the bottom surface of the seat plate, and the sliding seat slides back and forth along the base and is relatively fixed through a hand-turning adjusting screw; the left side and the right side of the sliding seat are respectively provided with a sliding block, the base is provided with a bottom plate, limiting plates are respectively and fixedly arranged above the left side and the right side of the bottom plate, a slideway is formed between each limiting plate and the bottom plate, a notch for the sliding block to enter the slideway is reserved on each limiting plate, and the sliding block can slide back and forth along the slideway after entering the slideway from the notch from top to bottom; the center of the bottom plate is provided with a long waist hole, the bottom surface of the sliding seat is provided with a threaded connecting hole, and the hand-turning adjusting screw penetrates through the long waist hole to be connected with the threaded connecting hole.

2. The seat back and forth adjustment mechanism of claim 1, wherein: the bottom plate both sides upwards extend and have the curb plate, the curb plate upper end is bent to the bottom plate middle direction and is formed the diaphragm, the diaphragm is bent downwards again and is formed the limiting plate, the breach form on diaphragm and limiting plate.

3. The seat back and forth adjustment mechanism of claim 1, wherein: the left side and the right side of the sliding seat are respectively provided with two sliding blocks, and the sliding blocks protrude out of the side wall of the sliding seat along the width direction; the two sliding blocks are arranged in tandem at the same side of the sliding seat; correspondingly, two notches are correspondingly arranged on the limiting plates on the left side and the right side of the bottom plate.

4. The seat back and forth adjustment mechanism of claim 1, wherein: the seat frame is square, the base is arranged in the middle of the seat frame in the width direction, the front end and the rear end of the base are fixedly connected with the front end and the rear end of the seat frame, and the base is respectively spaced from the two sides of the seat frame.

5. The seat back and forth adjustment mechanism of claim 1, wherein: the sliding seat is hollow, and is formed by sinking the center of the seat plate, and the upper end of the sliding seat is open.

6. The seat back and forth adjustment mechanism of claim 1, wherein: the seat board is provided with a seat cushion, the seat board and the seat cushion are fixedly installed through a rotary buckle, the rotary buckle comprises a cap body, the middle of the cap body is provided with an inserting column, two ends of the diameter of the side wall of the inserting column are respectively provided with a bulge, the seat board and the seat cushion are respectively provided with a slotted hole A and a slotted hole B which correspond to the bulges and the inserting column, the slotted holes A and the slotted holes B are communicated in the front and back direction, the inserting column of the rotary buckle penetrates through the slotted hole A on the seat board firstly and then continues to penetrate through the slotted hole B on the seat cushion, and meanwhile, the rotary buckle enables the bulges to be staggered with the slotted hole B.

7. The seat fore-aft adjustment mechanism of claim 6, wherein: the seat cushion comprises a seat shell and a soft cushion, and the slotted hole B is formed in the seat shell.

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